Perhaps you should try some spelling variations:
tai khoi » tai khoa, mai khoi, tao khoi
qua cham » qua hai, qua cac, va cham
hanh tai » thanh tai, hang tai, hinh tai
tu sach » thu sach, su sach, te sach
han tai » hang tai, nhan tai, van tai
cham lo » cham o, cam lo, cham soc
sach ky » sac ky, sach y, sach ty
tai hoi » dai hoi, tai hai, tai hoe
cua tre » cua te, cuu tre, cua triet
lo va » lo van, lao va, ly va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((tai hoi) or (tai khoi)). hieu qua cham lo va ((hanh tai) OR (han tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((tai hoi) OR (tai khoi)). hieu qua cham lo va ((hanh tai) OR (han tai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((tai hoi) or (tai khoi)). hieu qua cham lo va ((hanh tai) OR (han tai)) cua tre*".